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I have a 2000 blazer with an a/c leak. I had a mechanic check it out and dye showed a leak in the condenser so we changed it out. It is still leaking somewhere but it has to be somewhere that the dye does not show up easily. Does anyone have any ideas on where to look? I would appreciate any help.

There are a limited number of components in the A/C system. You basically have the condenser (in front of the radiator), the evaporator (inside the HVAC housing), compressor, accumulator (filter/dryer - big silver can), expansion block (orifice tube), and the lines. If it is still leaking down, and you do not see any dye, then it mostlikely is leaking at or near the evaporator. The HVAC housing extends into the engine compartment and has a location that can be opened up (cut out) for inspection of the evaporator. It is on the motor side of the HVAC housing and will be a recess in the plastic case. This is meant to be cut out for cleaning/sanitizing of the evaporator area in the HVAC housing. Before cutting it open, make sure to fully check all of the other components in the A/C system for leaks.

I believe that GM sells a cover for over the inspection hole location for after you cut out the section, but I do not recall what it is.

You may want to check the evaporator drain tube (beneath the vehicle) for any signs of oil or UV dye. That's the drain that makes water run behind the front passenger side tire when the A/C is operating. In some cases, the evaporator drain will have a trace of UV dye indicating the leak. That's just one of the tips to finding those hard to find leaks. Good luck! Hope this helps!

Check all the connectors that you can see on the a/c lines. Generally dirt will stick to the oil that leaks out with the refrigerant and will show as black spot of gunk.
A common leak is also at the compressor front seal and the indication is usually a stain across the underside of the hood as the oil is spun off the compressor.

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My compressor was leaking last summer. So i got a new one from autozone and replaced it, pulled a vaccume and recharged it. o, and i also changed the accumelator. it blew nipple hardening air for about 3 weeks and then i had to change the engine. when the mechanic went to reclaim the refrigeant he said here was only 2 oz in the system. so im guessing its the condensor or evapoator. any idea how hard/time consuming it is to do the swap for both and how much $$$ they are?